Linear Single Cell Li-lon Battery Charger with Single Input Supply for Portable Applications

The RT9516 is a fully integrated low cost single-cell Li-Ion battery charger ideal for portable applications. The RT9516 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port inputs. The RT9516 enters sleep mode when supplies are removed. The RT9516 optimizes the charging task by using a control algorithm including preconditioning mode, fast charge mode and constant voltage mode. The charging task will keep in constant voltage mode to hold the battery in a full charge condition. The charge current can be programmed with an external resister. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9516 features 28V maximum rating voltages for VIN. The other features are under voltage protection, over voltage protection for AC adapter supply.
RT9516 also provide a booting assistant circuit which detect input source and battery connection condition and provide an output signal (ABO) for system booting.
The RT9516 is available in WDFN-8L 2x2 tiny package to achieve best solution for PCB space and total BOM cost saving considerations.